Most people visit the park as part of a day trip from Quito. Most day tours leave from the city very early.
You can also stay up there. The lodge I stayed at was the Tambo Condor.
There is some nice scenery, including rivers, mountains and lakes...
Most people come to this high altitude reserve to try and find Andean Condor, but there are also some other species that can be seen up here with relative ease from the road.